/Engine/Plugins/Experimental/StructUtils/Source/StructUtils/Public/PropertyBag.h
Changes the type of this bag to the specified other bag, copies base values from the other bag, and migrates existing values over. The properties are matched between the bags based on the property ID.
void MigrateToNewBagInstance ( const [FInstancedPropertyBag](API\Plugins\StructUtils\FInstancedPropertyBag) & NewBagInstance )